Anisole reacts with Br2 in the presence of CS2 as solvent to give: (4) A mixture of 2-Bromoanisole and 4- Bromoanisole. - When anisole is reacted with bromine in the solvents of low polarity (like CS2), then the bromination takes place at ortho and para positions.

What happens when anisole reacts with Br2?

The methoxy group present in anisole will donate its electron density of the oxygen atom to the benzene ring and therefore the electron density on the benzene ring will increase and it will undergo electrophilic aromatic substitution, resulting in halogenation.

What happens when anisole reacts with bromine?

The methoxy group present in anisole acts as an electron donating group and it will donate its electron density of the oxygen atom to the benzene ring and thus, the electron density on the benzene ring will increase. Further, this will undergo electrophilic aromatic substitution, resulting in halogenation.